Plate Capacitor

Parallel plate capacitor with dipolar polarization. Adapted from https://tikz.net/capacitors. All credit to Izaak Neutelings (Feb 2020).

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% Parallel plate capacitor with dipolar polarization.
% Adapted from https://tikz.net/capacitors.
% All credit to Izaak Neutelings (Feb 2020).
\documentclass[border=3pt,tikz]{standalone}
\usepackage{mathtools}
\usetikzlibrary{decorations.markings}
\colorlet{Ecolor}{orange!90!black}
\colorlet{pluscolor}{red!60!black}
\colorlet{minuscolor}{blue!60!black}
\tikzstyle{anode}=[top color=red!20, bottom color=red!50]
\tikzstyle{cathode}=[top color=blue!20, bottom color=blue!40]
\tikzstyle{charge+}=[very thin,top color=red!50, bottom color=red!80]
\tikzstyle{charge-}=[very thin,top color=blue!40, bottom color=blue!70]
\tikzset{EFieldLine/.style={
  Ecolor, decoration={markings, mark=at position #1 with {\arrow{stealth}}}, postaction={decorate}}
}
\def\dph{0.3} % dipole height
\def\dpw{0.1} % dipole width
\def\dipole#1{
  \begin{scope}[shift={(#1)}]
    \draw[charge-] (-\dph,0) to[out=90,in=180] (0,\dpw) -- (0,-\dpw) to[out=180,in=-90] cycle;
    \draw[charge+] ( \dph,0) to[out=90,in=0] (0,\dpw) -- (0,-\dpw) to[out=  0,in=-90] cycle;
    \node[scale=0.7] at (-\dph/2,0) {$-$};
    \node[scale=0.7] at ( \dph/2,0) {$+$};
  \end{scope}
}
\def\height{5}
\def\width{3}
\def\platewidth{0.5}
\def\dielwidth{0.13*\width}
\def\nfieldlines{6}
\def\ncharges{7}
\begin{document}
% capacitor with dipolar polarization
\begin{tikzpicture}
 
 
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